The interior of an unoccupied communal cellblock is seen at Camp VI, a prison used to house detainees at the U.S. Naval Base at Guantanamo Bay in this March 5, 2013 file photo. REUTERS/Bob Strong/Files

White House press secretary Jay Carney gestures as he speaks during his daily news briefing at the White House in Washington, Wednesday, May, 1, 2013. Carney said the White House is currently considering administrative actions President Obama can take to help push the process of closing the detention facility at Guantanamo Bay but said he will ultimately need cooperation from Congress.(AP Photo/Pablo Martinez Monsivais)

FILE - In this June 27, 2006 file photo, reviewed by a US Department of Defense official, US military guards walk within Camp Delta military-run prison, at the Guantanamo Bay US Naval Base, Cuba. President Barack Obama's stated desire to try anew to close the Guantanamo Bay prison remains a tough sell in Congress. The White House may look instead toward smaller steps, such as a new push to move some terror suspects overseas. (AP Photo/Brennan Linsley, file)

FILE - In this Dec. 4, 2006 file photo reviewed by a U.S. Dept of Defense official, a detainee shields his face as he peers out through the so-called "bean hole" which is used to pass food and other items into detainee cells, at Camp Delta detention center, Guantanamo Bay U.S. Naval Base, Cuba. Lt. Col. Samuel House said Friday, April 26, 2013 that 97 men are now on strike, up three from the day before. He says 19 of them are receiving liquid nutrients through a nasal tube to prevent dangerous weight loss. Another five are under observation at the hospital on the U.S. base in Cuba. The hunger strike began in February 2013, with prisoners protesting conditions and their indefinite confinement. The U.S. holds 166 prisoners at Guantanamo, most without charges. (AP Photo/Brennan Llinsley)

In this April 18, 2013 video frame grab reviewed by the U.S. military, soldiers walk past detainees' cells during early morning prayer at Guantanamo Bay Naval Base, Camp 5, in Cuba. Prison officials opened the prison to journalists, portraying the atmosphere as tense but under control at this detention center following a Saturday clash between prisoners and guards. (AP Photo/Suzette Laboy)

This April 16, 2013 video frame grab reviewed by the U.S. Military, shows some of the makeshift weapons that were confiscated from prisoners at the Guantanamo Bay prison following a Saturday clash between prisoners and guards, during a media tour at Guantanamo Bay U.S. Naval Base, Cuba. Prison officials opened the prison to journalists, portraying the atmosphere as tense but under control at this detention center. Military officials said detainees created makeshift weapons out of nail filers, rods from fitness equipment and poles with tape. (AP Photo/Suzette Laboy)

In this image reviewed by the U.S. Military, Navy Capt. Robert Durand stands next to some of the makeshift weapons, including broomsticks and batons made of plastic and steel, that were confiscated from prisoners at the Guantanamo Bay prison following a Saturday clash between prisoners and guards, on display for the press at the U.S. Naval Base Guantanamo Bay in Cuba, Tuesday, April 16, 2013. Soldiers with riot helmets and shields swept into recreation yards and met with resistance from several dozen prisoners, the leadership of the detention center said. The guard force raided Camp 6 because the prisoners had for several weeks covered up 147 of the 160 security cameras, making it impossible to monitor them amid a weeks long hunger strike. The hunger strike goes on, with 45 prisoners refusing meals and 13 being force fed, officials said. (AP Photo/Ben Fox)

FILE - In this May 13, 2009 file photo reviewed by the U.S. military, the sun rises over the Guantanamo detention facility at dawn, at the Guantanamo Bay U.S. Naval Base, Cuba. An upcoming session of the Guantanamo war crimes tribunals has been postponed Thursday, April 11, 29013 amid defense complaints that a Pentagon computer failure and mishandled emails may have compromised their work. (AP Photo/Brennan Linsley, File)